The Identification
of Violation Areas for
the 8-Hour 1997 Ozone Standard

On April
15, 2004, EPA announced that there were 474 counties that were
identified as nonattainment for the 1997 8-hour standard. The
number of nonattainment counties for the 1997 revoked standard
is 176. Maps are available to inspect the
current nonattainment areas.